/ Dictionary / Index E extended complex plane: Meaning and Definition of Find definitions for: extend'ed com'plex plane' Pronunciation: [key] — Math. Math. the complex plane with a point at infinity added. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. extended care extended coverage Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language